The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 05, 2002
Filed:
Dec. 09, 1999
Applicant:
Inventors:
Thomas Baier, München, DE;
Georg Strauss, München, DE;
Assignee:
EPCOS AG, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H 9/64 ; H03H 9/145 ;
U.S. Cl.
CPC ...
H03H 9/64 ; H03H 9/145 ;
Abstract
A dual-mode surface acoustic wave filter that can optionally be operated balanced or unbalanced, having tracks which are coupled to one another via coupling converters. The filter has interdigital converters for each track which are disposed within reflectors and act as input and output converters. The impedance of the input and/or output converters of the filter is determined by omission or overlap weighting and/or by splitting the input and output converters into a plurality of individual converters. At least some of the individual converters are connected in series, for each acoustic track.